Skia

Following up on https://github.com/flutter/flutter/pull/93510

This PR introduced changes to golden file images. The engine roll sheriff triaged them, resulting in no images listed as untriaged in the changelist summary UI (https://flutter-gold.skia.org/cl/github/93510).

This change was blocked though by our flutter-gold check that looks up https://flutter-gold.skia.org/json/v1/changelist_summary/github/93510 to make sure images are triaged before changes can land.
The result of this at the time was:

```
{
  "changelist_id": "93510",
  "patchsets": [
    {
      "new_images": 6,
      "new_untriaged_images": 2,
      "total_untriaged_images": 2,
      "patchset_id": "1097533850dc8ea158597597b2f17dd2339ee0d2",
      "patchset_order": 4
    }
  ],
  "outdated": false
}

```

So it appeared there were still untriaged images.
Clearing the cache resolved the issue.

I also want to note though that Gold may have been very confused at the time. A new key/value pair was added to our instance and not checked in via pre-submit so Gold was randomly receiving images in post-submit for about a week. This breakdown of process may or may not have caused an issue with the cache, https://github.com/flutter/flutter/issues/93515 is being addressed in flutter/flutter to prevent this in the future.